Bleach bypass is a photo effect used very often in the movie industry. It has been used in such films as Saving Private Ryan, Minority Report and many others. To achive this effect, filmmakers either parcially or completely skip bleaching during the processing of a color film giving as a result a black and white image over a color image. This creates reduced saturation and exposure latitude along with increased contrast and graininess giving a kind of gritty, dirty look to the image. This is done in special professional labs for an additional cost and might be dificult for one to find a lab that processes film in this way. Luckily we can turn to Photoshop to achieve this effect without much trouble.